Question

I am a Java developer and have just started learning C# to develop a couple project. I am happy to see that many Java frameworks that I am used to work with (log4j, ant, hibernate etc.) have their .net versions (log4net, nant, nhibernate).

I have just created a project and tried to put log4net assembly reference in it, but I am having the following warning (followed by 4 errors informing failure to recognize log4net namespace and classes):

The referenced assembly “log4net”
could not be resolved because it has a
dependency on “System.Web,
Version=4.0.0.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a” which
is not in the currently targeted
framework
“.NETFramework,Version=v4.0,Profile=Client”.
Please remove references to assemblies
not in the targeted framework or
consider retargeting your project.

I added reference to System.Web.ApplicationServices and System.Web.Services but it’s not working. Any help on solving this dependency issue will be much appreciated.

Thanks

Answer 1

UPDATE:

If you’re still getting this error, you’re using an out-of-date version of log4net and you should consider updating to the current version, which does not require the full .NET 4.0 framework. Thanks to @Philippe for pointing this out in a comment.

---

Your project is referencing the .NET 4.0 client profile which does not include System.Web; you actually need to reference the full framework.

See How To: Target a Specific .NET Framework Version or Profile on MSDN for directions.

1. In Visual Studio, open the project you want to change.
2. Right-click the project in Solution Explorer and then click Properties.

3. In the Project Designer, locate the Target Framework list, as follows.

   • For Visual Basic projects, click the Compile tab and then click
     Advanced Compile Options. The Target
     Framework list is in the Advanced
     Compiler Settings dialog box.
   • For Visual C# projects, the Target Framework list is on the
     Application tab of the Project
     Designer. For more information, see
     Application Page, Project Designer
     (C#).
   • For Visual F# projects, the Target Framework list is on the
     Application tab of the Project
     Designer.

4. In the Target Framework list, select the .NET Framework version or
   profile that you want. When you click
   OK, the project unloads and then
   reloads in the integrated development
   environment (IDE). The project now
   targets the .NET Framework version
   that you just selected.

Possibly also of interest is Troubleshooting .NET Framework Targeting Errors.